Caican Cai created CALCITE-6438:
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Summary: Add optimization to returns empty when the filter
operator is a false instance
Key: CALCITE-6438
URL: https://issues.apache.org/jira/browse/CALCITE-6438
Project: Calcite
Issue Type: New Feature
Components: core
Affects Versions: 1.37.0
Reporter: Caican Cai
Fix For: 1.38.0
{code:java}
select * from emp where false{code}
The current logical plan in calcite is
{code:java}
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalFilter(condition=[false])
LogicalTableScan(table=[[CATALOG, SALES, EMP]]) {code}
It can be optimized to
{code:java}
LogicalProject(EMPNO=[$0], ENAME=[$1], JOB=[$2], MGR=[$3], HIREDATE=[$4],
SAL=[$5], COMM=[$6], DEPTNO=[$7], SLACKER=[$8])
LogicalValues(tuples=[[]]) {code}
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